(Objective-C) Iterate Over ZIP Entries Using EntryAt

This example demonstrates how to use the EntryAt method to iterate over all entries contained within a ZIP archive.

The EntryAt method retrieves a ZipEntry object for a given zero-based index.

This is useful for:

• Enumerating all entries in a ZIP archive
• Inspecting filenames, sizes, and timestamps
• Searching or filtering ZIP contents

Suppose the ZIP archive contains:

docs/readme.txt
images/logo.png
data/config.json

The example loops through all ZIP entries and prints information about each entry.

Note: This example requires Chilkat v11.0.0 or greater.

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#import <CkoZip.h>
#import <CkoZipEntry.h>

BOOL success = NO;

success = NO;

// Open an existing ZIP archive.
CkoZip *zip = [[CkoZip alloc] init];

success = [zip OpenZip: @"example.zip"];
if (success == NO) {
    NSLog(@"%@",zip.LastErrorText);
    return;
}

// Get the total number of entries in the ZIP archive.
int numEntries = [zip.NumEntries intValue];

NSLog(@"%@%d",@"Number of ZIP entries = ",numEntries);

// Create a ZipEntry object that will be reused
// for each entry retrieved by EntryAt.
CkoZipEntry *entry = [[CkoZipEntry alloc] init];

// Iterate over all ZIP entries.
int i = 0;
while (i < numEntries) {

    // Retrieve the entry at index i.
    success = [zip EntryAt: [NSNumber numberWithInt: i] entry: entry];
    if (success == NO) {
        NSLog(@"%@",zip.LastErrorText);
        return;
    }

    NSLog(@"%@%d",@"Entry ",i);
    NSLog(@"%@%@",@"  FileName: ",entry.FileName);
    NSLog(@"%@%d",@"  Uncompressed Length: ",entry.UncompressedLength);
    NSLog(@"%@%d",@"  Compressed Length: ",entry.CompressedLength);
    NSLog(@"%@",@"");

    i = i + 1;
}

// Sample output:
// 
// Entry 0
//   FileName: docs/readme.txt
//   Uncompressed Length: 1204
//   Compressed Length: 512
// 
// Entry 1
//   FileName: images/logo.png
//   Uncompressed Length: 84211
//   Compressed Length: 84102
// 

[zip CloseZip];

NSLog(@"%@",@"Done.");